Improvement in printing-telegraphs



I. H. BUNNELL.

PRINTING TELEGRAPH. No.180,700. Patented Aug.8, 1876.

N. am PH oiuToaRAPnEn. WA IN To UNITE STATES PATENT OFFICE.

JEssE H. BUANYNELL, OFVNEW YORK, n. Y.

IMPROVEMENT IN PRlNTlNG-TELEGRAPHS.

Specification forming part of Letters Patent No. 180,700, dated August8, 1876; application filed December 6, 1875. d

To all whom it may concern:

Be it knownthat I, JEssE H. BUNNELL, of the cityand State of New York,have in,- vented an Improvement in Printing Telegraphs, of which thefollowing is a specification:

Prin'ting-telegraphs have been made with a unison mechanism that isbrought into action by a continuation of the revolving mechanism. Thetype-wheel has also been revolved by spring or weight power, and anescapement has been applied thereto, that was moved by a magnet, andallowed the typewheel to be moved around step by step, or to turn at onebound to the unison-point; but such escapement was rigid, and bothpallets were moved by the electro-magnet in bringing the type-wheel tounison.

My invention relates to the combination, with a type-wheel and itsrotating mechanism, of an escapement that is made of two pallets, one ofwhich is capable of motion independent of the other, and is controlledby an electro-magnet, the parts being constructed so that the twopallets move together when the type-wheel is being set for printing, andthe pallet that is capable of separate mo tion is withdrawn when thetype-wheel is to revolve around to unison. By this construction thepallets are more easily and reliably moved than those heretoforeemployed to accomplish a similar object.

In the drawing, Figure 1 is an elevation of the apparatus with thetype-wheel removed. Fig. 2 is a plan below the line as a), and Fig. 3 isan elevation of the escapement-in a slightly modified form.

The shaft a is rotated by a spring-barrel, b, and train of gearing orother suitable means, and upon this shaft a is the escapement-wheel 0,and the type-wheel d is either upon the same shaft or connectedtherewith, so as to be rotated with, or stopped by, said shaft to. Theescapement-pallets o 6 allow the wheel 0' to rotate, and the number ofteeth and the spaces upon the type-wheel correspond, or one is amultiple of the other.

The pallets are controlled by an electromagnet or by electro-magnets, soas to give a step-by-step motion. One magnet and a retractile spring canbe used; but I prefer to use the two magnets h k and alternate thecurrents, positive and negative, as usual.

The pallets may be upon the vibrating 1ev er l, as in Fig. 3, or theylets, as in Figs. 1 and 2.

Ordinary pallets of escapements are conmay be spring-palstructed so thatthe escapement-wheel cannot ment-lever, so as to be moved out of the wayof the arm 1' when it is turning around under the ordinary circumstancesof setting the type-wheel to print a letter. Thereby the unison will notbe operative periodically or by the printing-lever, but will be underthe control of the electro-magnet c. 4

I have shown in Fig. l-the armature-lever t of the electro-magnet 'v asacting upon the.

spring 3 of the pallet o to draw the same back, and in Fig. 3 thearmature-lever t is represented as acting against a spring-lever, at oneend of which is the pallet o, the operation in either case being thesame.

The electro-magnet 41 may be made operatime by increasing the electricaltension by additional battery-power thrown into the line at thesending-station, so as to overcome the spring 4' or the same may be asluggish magnet, that ordinarily will prevent a spring drawing back thepallet while the pulsations aresent to set the type-wheel, but whichspring will be allowed to draw back the pallet and bring the type-wheelto unison when the circuit is broken or the battery-power small.

I claim as my invention The combination, with the type-wheel of aprinting-telegraph and its revolving mechanism, of an escapement and twopallets, one of which is movable independent of the other,

and an electro-magnet for moving such pallet, and a unison-stop,substantially as set forth.

Signed by me this 3d day of December, 1875.

J. H. BUNNELL.

Witnesses GEO. T. PINCKNEY, CHAS. H. SMITH.

